com.mtech.easyexchange.dao.impl.AbstractDaoImpl.java Source code

Introduction

Here is the source code for com.mtech.easyexchange.dao.impl.AbstractDaoImpl.java

Source

/*
 * This file is part of EasyExchange.
 *
 * (c) 2014 - Machiel Molenaar <machiel@machiel.me>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

package com.mtech.easyexchange.dao.impl;

import com.mtech.easyexchange.dao.AbstractDao;
import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.criterion.Criterion;

import java.io.Serializable;
import java.util.List;

public class AbstractDaoImpl<T, ID extends Serializable> implements AbstractDao<T, ID> {

    protected Class<T> entityClass;

    protected SessionFactory sessionFactory;

    protected AbstractDaoImpl(Class<T> entityClass, Session session) {
        this.entityClass = entityClass;
        this.sessionFactory = session.getSessionFactory();
    }

    @Override
    public Session getCurrentSession() {
        return sessionFactory.getCurrentSession();
    }

    @Override
    @SuppressWarnings("unchecked")
    public T find(ID id) {
        Transaction tx = getCurrentSession().beginTransaction();
        T result = (T) getCurrentSession().get(entityClass, id);
        tx.commit();

        return result;
    }

    @Override
    public void save(T entity) {
        Transaction tx = getCurrentSession().beginTransaction();
        getCurrentSession().saveOrUpdate(entity);
        tx.commit();
    }

    @Override
    public void delete(T entity) {
        Transaction tx = getCurrentSession().beginTransaction();
        getCurrentSession().delete(entity);
        tx.commit();
    }

    @Override
    @SuppressWarnings("unchecked")
    public List<T> findBy(Criterion... criterions) {
        Transaction tx = getCurrentSession().beginTransaction();
        Criteria criteria = getCurrentSession().createCriteria(entityClass);

        for (Criterion criterion : criterions) {
            criteria.add(criterion);
        }

        List<T> result = (List<T>) criteria.list();

        tx.commit();

        return result;
    }

    @Override
    @SuppressWarnings("unchecked")
    public T findOneBy(Criterion... criterions) {
        Transaction tx = getCurrentSession().beginTransaction();
        Criteria criteria = getCurrentSession().createCriteria(entityClass);

        for (Criterion criterion : criterions) {
            criteria.add(criterion);
        }

        T result = (T) criteria.uniqueResult();

        tx.commit();

        return result;
    }
}